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With racing roots dating back over 70 years, JE Pistons is the industry leader in high-performance forged pistons. JE’s performance and quality is the result of decades of experience gained working with elite engine builders and racers from almost all types of motorsports competition, and is proven in our victories, championships, and innovations. JE controls every step of our manufacturing process, designing, forging, and machining all our pistons 100% in-house in our USA manufacturing facility. Find the perfect set of pistons for your next build off-the-shelf, or work with our technical experts to create a completely custom set.

JE History


The origins of what we know today as JE Pistons can be traced back to 1912 and the Los Angeles foundry of William Jahns Sr. and his company W.H. Jahns. Employing the tagline, “Nothing but Pistons,” the W.H. Jahns company produced pistons and semi-finished pistons until 1948, when Jahns Sr. retired. Meanwhile, Jahns’ son, William “Uncle Bill” Jahns Jr., started and had been working on his company Jahns’ Racing Pistons since 1947. Shortly after, the business became Jahns’ Engineering Pistons, and was finally shortened to JE Pistons.

Through the following years, JE Pistons’ technology evolved, from mastering casting technology in the 60s to researching and implementing forging technology in the 70s. Numerical Controlled (NC) machines were introduced to manufacturing in the early 80s, which was quickly improved to the use of Computer Numerical Controlled (CNC) machines and a proprietary piston design and machining program in the mid-80s.

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14 hours ago

Some heavy duty high compression equipment for this K24 Honda build 💪 #JEpistons #forgedpistons #honda #kseries #k24 #howmuch #yes

#reposted BrianCrower Inc K24 N/A build featuring BC0043-2 cams, dual spring & titanium retainer kit, BC LW K24 rods with ARP fasteners and head studs along with a set of high compression (13.7:1) JE pistons.
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Some heavy duty high compression equipment for this K24 Honda build 💪 #JEpistons #forgedpistons #honda #kseries #k24 #howmuch #yes   

#reposted BrianCrower Inc K24 N/A build featuring BC0043-2 cams, dual spring & titanium retainer kit, BC LW K24 rods with ARP fasteners and head studs along with a set of high compression (13.7:1) JE pistons.Image attachmentImage attachment
1 day ago

A warm welcome to the 7s club!! 7️⃣.9️⃣5️⃣ Major congratulations to Ricky Silva and the whole CLM Motorsports team, this one's been a long time comin#PoweredByJEd#jepistonsstons ... See MoreSee Less

0 CommentsComment on Facebook

2 days ago

Awesome opening round of MotoAmerica Twins Cup for the Chief's Racing Team with a P2 in race 1 on Saturday at Barber Motorsports P#PoweredByJEdb#reposteGreg Reisingerng996
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MotoAmerica Twins Cup race 1 was pretty killer for CRT rider Cassidy Heiser as you may be able to tell from the pics. Cassidy loves to ride in the rain and it showed today. It was not without drama. There was a technical problem that prevented him from making it out for the rain familiarization laps. He made the best of it, went out and rode a very smart race and got himself and the team it's first MotoAmerica Twins Cup Podium, finishing in 2nd! A great day the team won't soon forget. Thanks to Cassidy's Mom, Dad, Uncle Mark, Jeff Johnson and everyone that has supported Cassidy and the te#roadracing #babermotorsportsparkb#jer#jepistonsspark #je #jepistons
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Awesome opening round of @motoamerica Twins Cup for the Chiefs Racing Team with a P2 in race 1 on Saturday at Barber Motorsports Park. #PoweredbyJE

#repost @chiefsracing996 
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MotoAmerica Twins Cup race 1 was pretty killer for CRT rider Cassidy Heiser as you may be able to tell from the pics. Cassidy loves to ride in the rain and it showed today. It was not without drama. There was a technical problem that prevented him from making it out for the rain familiarization laps. He made the best of it, went out and rode a very smart race and got himself and the team its first MotoAmerica Twins Cup Podium, finishing in 2nd! A great day the team wont soon forget. Thanks to Cassidys Mom, Dad, Uncle Mark, Jeff Johnson and everyone that has supported Cassidy and the team over the years!

#roadracing #babermotorsportspark #je #jepistonsImage attachment
3 days ago

It's been an awesome weekend of all th#LSs #LS performance her#lsfesttxestTX 🤠 talking builds including everything from streetable fun to max effort horsepower. Whatever you're LS swapping, we have the pistons c#lsfest🔥#forgedpistonsg#jei#jepistons##lsswapn#horsepowerh#lsbuildr #lsbuild ... See MoreSee Less

Its been an awesome weekend of all things #LS performance here at #LSFestTX 🤠 talking builds including everything from streetable fun to max effort horsepower. Whatever youre LS swapping, we have the pistons covered 🔥

#lsfest #forgedpistons #je #jepistons #lsswap #horsepower #lsbuildImage attachment
6 days ago

Another set of Ultra Series pistons fresh off the manufacturing floor, this one for the popular Honda K20C engines. Our in-house blends of Perfect Skirt and Ceramic Crown coatings are looking 👌 #UltraSeries #jepistons #forgedpistons #racingpistons #honda #kseries #k20 ... See MoreSee Less

Another set of Ultra Series pistons fresh off the manufacturing floor, this one for the popular Honda K20C engines. Our in-house blends of Perfect Skirt and Ceramic Crown coatings are looking 👌 #UltraSeries #JEpistons #ForgedPistons #RacingPistons #Honda #Kseries #K20Image attachmentImage attachment

2 CommentsComment on Facebook

Make a 510 piston kit kle 500 there is a market

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6 days ago

While the SX Championship may not have been in the cards, Levi Kitchen rode incredible all season long, and the SuperMotocross Championship isn't over! Looking forwarPro MotocrosscrossPro Circuit Racingeteam powere#jepistonsston#supercrossc#sxs#SMX #motocrossc#jes#procircuitr#pcraceteameteam ... See MoreSee Less

While the SX Championship may not have been in the cards, @_levikitchen rode incredible all season long, and the @supermotocross Championship isnt over! Looking forward to @promotocross 😎 | @pcraceteam powered by #JEpistons 🚀

#supercross #sx #smx #motocross #je #procircuit #pcraceteamImage attachment
1 week ago

Jeff Jones Racing grabbed a win in the Formula Drift #fdatl seeding bracket this past weekend in Atlanta and made a Top 16 appearance in Saturday's main event.

The Jones Ra#370z#370z was putting#UltraSerieseries pistons to wo#PoweredByJEdbyJE Larry Chen PhotoPhoto
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Jeff Jones Racing grabbed a win in the Formula Drift #FDATL seeding bracket this past weekend in Atlanta and made a Top 16 appearance in Saturdays main event. 

The Jones Racing #370z was putting our #ultraseries pistons to work 💨 #PoweredbyJE 

📸: Larry Chen PhotoImage attachment
1 week ago

A key part of our custom piston process is our ability to laser scan piston domes, combustion chambers, and many other components to make exactly what is needed for a specific application. We applied our 3D Ultra-Crown milling technique to the dome design to achieve exact measurements and also added some extra custom features like our 3D undercrown milling to finish this one off set of pistons. Custom pistons are our specialty and we take pride in delivering exactly what our customers need to win races!

#jepistons #CustomPistons #forged #billet #enginebuild #oneoffpieces #usamade
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A key part of our custom piston process is our ability to laser scan piston domes, combustion chambers, and many other components to make exactly what is needed for a specific application. We applied our 3D Ultra-Crown milling technique to the dome design to achieve exact measurements and also added some extra custom features like our 3D undercrown milling to finish this one off set of pistons. Custom pistons are our specialty and we take pride in delivering exactly what our customers need to win races! 

#jepistons #custompistons #forged #billet #enginebuild #oneoffpieces #usamadeImage attachmentImage attachment+2Image attachment

14 CommentsComment on Facebook

If can make this, why you send me this shit

If you have a profile on file already why does it currently take 6 to 8 weeks to make pistons.?

Had mine under crown milled, so light! Should help the stock crank last a bit longer while I save for a proper crank! One query, can you machine in a recess for the end of a spark plug? Couldn't see anything on the custom piston form.

How much does a set cost for 4032?

You make any for the 7.3?

Interesting, you mill the valve pockets and reliefs but leave the tool marks, whereas the squish looks much better / smoother finish. Any reason for that? Something to do with the fuel used (nitro not petrol) maybe?

Die-cast pistons, racing quality. Excellent.

I like mine, but my compression ratio ended up being somewhat higher than originally calculated, given the bore size, etc., and my piston crowns weren't finished nearly as nice as that. Still gonna run them, hope you can do better next set.

I really like the oil drain back holes done that way

Greetings Guy; My custom JE's from 1985. This picture is from 1995 after 10 years of use. Last I knew they were still pumpin' air & fuel. Ole' Bob. Ps: Purchased through Mike's custom engines, he's gone now.

Sure looks like a Ford piston to me. Cleveland maybe?

I love em

Finally someone doing it right! 👏

Ischa Vossenberg

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2 weeks ago

Smeding Performance showing off some of their latest #jepistons powered builds 💪 Jacob and the #smedingperformance crew choose our Ultra Series when they are looking to bring the best off-the-shelf performance period. #Reposted #smeding #je #UltraSeries #forgedpistons #racingpistons #pistontech #enginebuild #racecar ... See MoreSee Less

Smeding Performance showing off some of their latest #JEpistons powered builds 💪 Jacob and the #smedingperformance crew choose our Ultra Series when they are looking to bring the best off-the-shelf performance period. #reposted #smeding #je #ultraseries #forgedpistons #racingpistons #pistontech #enginebuild #racecarImage attachmentImage attachment+1Image attachment
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